What part of excel does the UVC break down...while on the subject, does anyone know what excel is made of? I've wondered for a while now.
well I dose excel daily so should I maybe turn off my uv at night with my lights and dose the excel at night
I'm not 100% sure if that would work or not

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A better idea would be to turn the UV off during the day and dose excel in the morning. Intake of carbon happens during photosynthesis, so only when there is light will the excel be used.
What form does this 'bio-available organic' carbon take in excel? And what process does the plant do to be able to use it instead? I'm presuming there are lesser used parts of photosynthesis that are like the calvin cycle but without CO2...anyone know?
I'm rather confuddled here

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I've used excel in the past, and I still have a bottle of it that I don't bother using - because I decided I didn't know enough about what it is and how it works to put it in with my fish

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Can anyone shed light on any of this?
edit:
A quick search on seachems page and through google has revealed that excel is in fact a polymerised isomer of
'glutaraldehyde' (C5H8O2) heavily diluted in water. Though very interesting, the wikipedia page doesn't exactly make me thrilled at the concept of putting this stuff in my tank

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Still not sure how it's used though.
It seems more reading is required...
edit 2: For anyone interested, the best source of info I can find is actually a page on seachems site, it appears even seachem arernt sure the exact process which breaks down the glutaraldehyde polymer.
Here it is.
As to the original question...from what garuf said, it appears UVC destroys glutaraldehyd, though I cant really find anything that either supports that or disputes it.